Seeing as some wireless charging pads look like skateboards already, why not enlist the most famous skateboard of all to be a wireless charger, the hoverboard from Back to the Future. Just lay a phone and top of the board and you’ll have enough power to traverse over water. Maybe.
The hoverboard sits on a clear plastic base to give the illusion that it is hovering in place. The design seen here is about the size of a keyboard, but could be made as small as a smartphone.
It has two Bluetooth speakers underneath. The speakers may sound fine with the board in its normal position, but just in case I included a pivoting stand. The phone can be placed on the stand as well.